My system has been extremely unstable since the last Windows updates about a week ago. Kaspersky Internet Security stops and restarts. Firefox, Outlook, World of Warcraft,etc crashing frequently. BSOD several times a day. I come to my desk and the logon screen is often there indicating the system crashed and rebooted while I was out.

This is very atypical for my system. I often go weeks without rebooting or having any program crash. I have noticed two error messages in the BSOD. One was memory management and the other was bad pool header. I suspect there have been others, but I'm not present every time Windows crashes.

Win7 Pro 64bit retail original OS on this system. I built this system about 6 months ago and it's been running very well until a week or so ago. Suggestions gratefully accepted.